INFO: task syz.4.1488:13327 blocked for more than 143 seconds. Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.1488 state:D stack:24848 pid:13327 tgid:13325 ppid:11840 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735 nfsd_nl_version_set_doit+0xc5/0x7a0 fs/nfsd/nfsctl.c:1813 genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2541 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2583 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2637 __sys_sendmsg+0x16e/0x220 net/socket.c:2669 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcbb5f7e819 RSP: 002b:00007fcbb6e4b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcbb6135fa0 RCX: 00007fcbb5f7e819 RDX: 0000000000004010 RSI: 00000000200004c0 RDI: 0000000000000003 RBP: 00007fcbb5ff175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fcbb6135fa0 R15: 00007ffc750c37d8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8ddbaf40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8ddbaf40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8ddbaf40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6744 2 locks held by getty/5599: #0: ffff8880317540a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fc62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/5850: #0: ffff8880123f80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880123f80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880123f80e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 4 locks held by kworker/u8:13/6213: #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x126b/0x1b30 kernel/workqueue.c:3204 #1: ffffc90004b4fd80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205 #2: ffffffff8fabf488 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:276 #3: ffffffff8ddc6878 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297 3 locks held by kworker/u8:32/7813: 2 locks held by syz.2.1481/13291: #0: ffffffff8fb5e1d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1671 2 locks held by syz.4.1488/13327: #0: ffffffff8fb5e1d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_set_doit+0xc5/0x7a0 fs/nfsd/nfsctl.c:1813 2 locks held by syz.3.1515/13447: #0: ffff88805eb320e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805eb320e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805eb320e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/13474: #0: ffff88805cbb20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805cbb20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805cbb20e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.5.1554/13645: #0: ffff88805b77a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805b77a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805b77a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/13690: #0: ffff88807a6e80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807a6e80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807a6e80e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/13761: #0: ffff8880404ea0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880404ea0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880404ea0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.0.1609/13941: #0: ffff88803340a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88803340a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88803340a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/14323: #0: ffff8880245800e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880245800e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880245800e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/14387: #0: ffff8880923c80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880923c80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880923c80e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.7.1766/14576: #0: ffffffff8fb5e1d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1671 2 locks held by syz-executor/14747: #0: ffff88801be880e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88801be880e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88801be880e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 1 lock held by syz.0.1826/14825: #0: ffff88803340a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88803340a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x176/0x3f0 fs/super.c:120 1 lock held by syz.0.1826/14827: #0: ffff88803340a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88803340a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x176/0x3f0 fs/super.c:120 2 locks held by syz-executor/14844: #0: ffff8880246c20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880246c20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880246c20e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.5.1893/15165: #0: ffffffff8fb5e1d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_set_doit+0xc5/0x7a0 fs/nfsd/nfsctl.c:1813 2 locks held by syz.6.1946/15395: #0: ffff88806f3c80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88806f3c80e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88806f3c80e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1bb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 7 locks held by syz-executor/15436: #0: ffff8880351b4420 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12b/0x250 fs/read_write.c:731 #1: ffff8880a59b7c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325 #2: ffff88802443f1e8 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x29e/0x500 fs/kernfs/file.c:326 #3: ffffffff8f060e68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 #4: ffff88807be870e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff88807be870e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff88807be870e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293 #5: ffff8880795ed250 (&devlink->lock_key#9){+.+.}-{4:4}, at: nsim_drv_remove+0x4a/0x1d0 drivers/net/netdevsim/dev.c:1675 #6: ffffffff8ddc6740 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x700 kernel/rcu/tree.c:4565 2 locks held by syz.9.1961/15452: #0: ffffffff8faa9390 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x292/0x6b0 net/core/net_namespace.c:496 #1: ffffffff8fabf488 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x1b/0x70 net/ipv4/nexthop.c:3878 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7811 Comm: kworker/u8:30 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:hlock_class+0x0/0x130 kernel/locking/lockdep.c:223 Code: df e8 84 8e 86 00 e9 c9 fe ff ff e8 7a 8e 86 00 e9 95 fe ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <48> b8 00 00 00 00 00 fc ff df 53 48 89 fb 48 83 c7 20 48 89 fa 48 RSP: 0018:ffffc900037bf808 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff888030170b30 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffff888030170b30 RDI: ffff888030170b30 RBP: ffffc900037bf950 R08: 0000000000000004 R09: 0000000000000000 R10: ffffffff969afdaf R11: 0000000000000002 R12: ffff888030170000 R13: 0000000000000200 R14: 0000000000000009 R15: 1ffff920006f7f08 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557de20b3250 CR3: 000000007bb12000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_lock+0xb5/0xc60 kernel/locking/lockdep.c:4727 mark_usage kernel/locking/lockdep.c:4670 [inline] __lock_acquire+0x9f1/0x3c40 kernel/locking/lockdep.c:5180 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x16a/0x1060 net/batman-adv/network-coding.c:719 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244